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#1
October 1st 05, 08:38 PM
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Electric Trim
The recent comments about the difficulty of setting electric pitch trim in a
Cirrus made me wonder if any electric trim systems use a design where the trim speed is proportional to switch deflection. Are they all single speed? Jon 
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#2
October 2nd 05, 12:46 AM
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In article ,
"Jon Woellhaf" wrote: The recent comments about the difficulty of setting electric pitch trim in a Cirrus made me wonder if any electric trim systems use a design where the trim speed is proportional to switch deflection. Are they all single speed? Trim motors generally run at the same speed as flap motors.
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#3
October 4th 05, 02:31 PM
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john smith wrote:
In article , "Jon Woellhaf" wrote: The recent comments about the difficulty of setting electric pitch trim in a Cirrus made me wonder if any electric trim systems use a design where the trim speed is proportional to switch deflection. Are they all single speed? Trim motors generally run at the same speed as flap motors. Usually slower actually. Flaps move further and go stop to stop faster in most planes I've flown.
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#4
October 4th 05, 02:30 PM
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Jon Woellhaf wrote:
The recent comments about the difficulty of setting electric pitch trim in a Cirrus made me wonder if any electric trim systems use a design where the trim speed is proportional to switch deflection. Are they all single speed? As we were taught in elementary control theory: Never use proportional control unless bang-bang doesn't work. Can't vouch for the Cirrus, but I've never had any problem with single speed electric trim (either in an Arrow or my Navion).
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